Dental handpiece



Nov. 11, 1 930. GROSS ET AL DENTAL HANDPIEGE' Filed April 24, 1928 2 Sheets-Sheet 1 gwvawtoq c]. 6 /055 1, He llmarz MW NOV. 11, 1930. GROSS ET AL 1,781,508

DENTAL HANDPIECE' Filed April 24, 1928 2 Sheets-Sheet 2 7.2 .3. --Z- j (a Z5 3. ,1 I

-lv Z9 i 5 5 E, l v 1:! I /6 I o 5 amnion I, ffalman Patented Nov. 11 1930 l L i UNITEDlSTAT ES PATENTOFJFICE JOSEPH enoss AND IsAec HELLiviaiv; or BRQNLNEW YORK "DENTAL HAN-DZPIEGE "Application-filed April 24, 1928.. Serial No. 272,492.

This invention relates to dentists drills, which at its rear end is formed to provide and more particularly to the hand-pieces in a portion u shaped in cross section and desig- 'which thedrills are mounted and by which nated 11 in Figure 5, these portions forming :thedril-ls are manipulated. in effect ears on one section, the extremity Y .The general object of the present invenof which overlaps the extremities of the cars 55 ition is the provisionof a hand-piece so conon the adjacent shanks, and the sections bestructed that it will cause two burrs to opingpivoted to'each other by the pins 12. The erate simultaneously parallel toeach other, portions 11 thus provide pivotal connections and further to provide a. hand-piece so for the shanks A and B whereby these shanks formed that the burrs may be spread apart maybe shifted into or out of a. parallel posi- 69 in any desired spaced relation to each other tion. The forward end of each section within the range of the instrument, this con is reduced in diameter and screw-threaded, stnuctionenabling the two burrsto be graduas at 13, for the reception of a second sec ally separated hile in operation so that the tion 14, Extending longitudinally through 1 walls of the cavity CLILbB made parallel and each section 10 is a shaft 15 which carries beveledat the same time. i at its rear end a pinion 16.

,Afurther object of the invention is to pro- The rear end of the casing or shank 10 is :vide a structure of thischaracter embodying formed with a bearing 17 for the shaft 15. As

:asplit hand-piece,- eachsection ofwhich carshown in Figure 2, the section14 is angularly uriesxa burr in its-driving mechanism, the hanbent and a shaft 18 which extends longitudi- -dle=o f the hand-piecehaving means whereby nally through this section 14 is angularly disthe driving mechanism-0f the two burrs may posed with referenceto the shaft 15. i

in turn be driven, the two sectionsof the For the purpose ofconnecting these shafts, handpiece being manually shiftable while toothed"clutchniembers 19 are provided on 7 1116 burrs are in use tospread them apart or the adjacent endsof the shaft sections 15 and todraw them toward eachot-her. 18 which mesh with each other at their lower Qther objectswill appear in thecourse of portions so that the shaft 18 is driven from i :the following description; the shaft 15. The forward end of the section .xQtlI' invention is illustrated in the accom 14 is reduced inrdiameter and screw-threaded, 0 [panying drawings, wherein a and fittingyoverthis reduced end is a ter-.

1 Figure 1 is a top plan view of a dental minal section 20 angular in form, wherein is hand-piece constructed in accordance with disposed a drill-carrying shaft 21 extending our invention; i a. p a r i at rightangles to the shaft 18. This drill- .Figure Q is a section on'the line 2 2 of carrying shank carries upon it the beveled 1-551 .Figurel ihut on. an enlarged scale, the for- .gear wheel 22 adapted toengage with a bevwardend of oneof the'sectionsbeing broken eled gear wheel :23 mounted uponthe shaft" away; i 1 l8. Adrill'shank24.isadapted to be inserted I Figure 3 is a section on theline 3 3 of in thedrill-rcarrying member 23 tobe rotated .F igure :2; thereby. This is theusual dental. drill. The

T4 Figure 4 is a section on the lined-41 0f drill is held in place within the chuck 011 .Figure 3; i member 23 byi the pivoted latch 25, such as Figure .5 free section on theline .5 5 of-usually found on dentalhandpieces.

Figure 3; p It willbe seen that-sofar we have described Referring to thesedrawings, it will be seen a dental hand-piece which, except for the pivthat *we have. illustrated "a .de-ntistZs handoted rear end, is identical with the ordinary 1 "piece, as it is termed, which is formedin two J dental hanctpiece, theordinary dental handshanks A and. B, these shanksbeing subpiece having the shaft 15. extending out from rstaniiially alike. nTherefore, the description the rear endwof the section. 10 and being -ofone shank applies to the. other. Each of adaptedto be connected to a flexible power- ?theseshan-ks comprisesa tubular section 10 driyen shaft. It will be seen that ourinven m w tion comprises a double dental hand-piece,

. the two shanks .or halves being pivotally conin parallelism to each other or should be ac curately diverged or converged. The device can also be used in preparationof the grooves for a pin ledge attachment; Obviously, the

casings or outer enclosures of the shafts will 6 I Y be provided with means wherebyfthe interior par-tsmay beoiled;v

@bviously, minor details changed v j Z without departing from the spirit ofithe in; I

vent-ion as defined in the appended claims, I

lVe clalm 1-. A dental hand-pieceof the character described comprising two shanks, the shanks tending through the axis ofthe gear wheel I-being-pivotallyconnectedtoeach otherfor 2 8, and hence order to permit the'proper swinging movement of the two. halves or shahks,thef pinions 16 are transversely concave, the concavityhaving a curvature such thatthe centerlofthis curvature is coincident.

I tions of the parts "power will be transmitted with'the pivotal axis 12 so that in all posifro1n'thewhee1'28to the pinions 16. c 7 I For the purposeof manually shifting these two shanks into 01' out of divergent relation, we mount upon the shaft 26 the slide 29.

' This slide has a plurality of apertured lugs through which the shaft passes andtheslide :is provided upon its under face with the 'finger'pi'ece30 whereby it may be manipu- 'lated The slide at its forward end is'pivotally connected to twolinks 31 which extend divergently'outward and in turnarespivotally connected at 32 tothe forwardends of the sections 10 in any suitable manner, these.

sections 10' being recessedto' receive these links and permittheir operation.

In the operation'of this device, power is transmitted to shaft 26 from any suitable j, source of power by "means of a flexible shaft 3 40 or other like instrumentality andboth the e shafts formed of the sections 15 and'18'a're rotated atya high rate o fspeed, thus driving the drills 24 at a high ratelofspeed. 1

g It will be seenthat this hand-piece holdstwo dental burrs parallel to each other which :"work simultaneously in -two opposite directions on a tooth. Thetwo burrs-maybe held iirparallel relation, of course,"while they t, I operate or'theyc'an be" adjusted whilejin operation to any desired distance from each foth'er within the rangeyof the instrument,

i'which isordinarily one'inch. The two burrs {'while lthey operate may also begradually The pu'rposeof he hand P1666 isto facilishifted apart or gradually brought together ,i so .asto form bevels or dove-tails.

tate thepreparation of parallel'walls in a tooth for inlays or similar restorations where parallelism of thewalls is essential. It can also be used for the preparation of parallek beveled wallsforfinlays or maki'ng parallel grooves on two opposite sides of a tooth for where it isdesired thatthe burrs shall move three quarter crowns or Carmichael crowns, andithe device can be used 1n any instance movement into or out ofdivergent relation,

drivenfsha-ftsfdisposed in each' shank, each v shank at 'its iend having a burr engagingthe drivenshaft thereof, vr'neans 1 common to both shafts whereby both shafts may be driven simultaneously and manually operablemeanse whereby the'shanks may be shifted toward l "or' from each'other, 1 I I v 2. A dental hand-piece of the character described comprising'tw'o' shanks pivotally connected' to each other for "moveinent 'into or V out of divergent relation, a driving shaft supported between the two shanks and having means whereby it may be connected to a driving means, lateral shafts, one for each of the shanks, extending longitudinally therethrough and havin'ga pinion, the driv- 'ing shafthaving a gearengagingthe pinion,

e'achfshank at its extremity having a burr engag d: by the longitudinal shaft 0f the shank and extending sit-right angles to the shaft but ea ed thereto, and manually op-* erable means whereby the shanks may {be shifted toward or from each other. g

3. Ardentalhand piece of he character de-' scribed comprising twomembers, -each having a longitudinally"extendingdriving shaft and a rotatable burr-carrier at the endof the member operatively -connecte'd to said shaft, the twomenibers being pivotally connected to each other formovement:intotorfl 'out'of divergent relation, a driving-shaft disposed between; the two members and operatively connectedto theshafts thereof to drive the two lateral shafts 'simultaneously,-and manually operable means for shifting the" shafts {into or out of divergent relation comprising a slide mounted uponfthe driving I shaft and-having a link connectionfto the two members, the slide havingathumb piece it. A dentalhan'd-piece of the character described'comprisi'ng two members, each meri her having a casing, the membersbeingpivotally connected to each other for movement into or outjof divergentirelation, a' -dri-vling nectedto a driving means, a lateral shaft supportedb y'each of said members, the drivingshaft'h'avinga gear and the lateral shafts" driven signatures.

each having a gear meshing with the first named gear, each member at its end having a burr-engaging shaft extending at right angles to the shaft of the member but geared thereto, and manually operable means whereand links pivotally connected to the longitudinally shiftable member and to the shanks whereby the shanks may be shifted into or out of divergent relation.

6. A dental l1and-piece comprising two Shanks being pivotally mounted for movement into or out of divergent relation, driven shafts disposed in each shank, means common to both shafts whereby both shafts may be driven simultaneously, and a manually operable means to shift the shanks toward or from each other.

In testimony whereof we hereunto affix our JOSEPH GROSS.

ISAAC HELLMAN. 

